Detention window



Nov. 22, 1938.. w. D. BAYLEY 'DETENTION WINDOW Filed March 28, 1935 SSheets-Sheet 1 l0 gwuento'u 1 wl/namp Bay/e l a mw sh Nov. 22, 1938.. w. D. BAYLEY DETENTION WINDOW 3 Sheets-Sheet 2 Filed March 28, 1955 INVENTOR.

Wl/lmm D Bay/e BY III/I Nov. 22, 1938. w. D. BAYLEY DETENTION WINDOW 3 Sheets-Sheet 3 Filed March 28, 1935 gwvemtoz 1 W/W/amD. Hay/er Patented Nov. 22, 1938 UNITED STATES PATENT OFFICE The William Bayley Company,

Springfield,

Ohio, a corporation of Ohio Application March 28,

25 Claims.

This invention relates to detention windows and more particularly to the closure assembly associated with the ventilating-area.

Extending muntin bars across the ventilating areas soas to function as detention bars is shown to be old in the Bayley Patents Nos. 1,948,159 and 1,948,160, but in each of these the closure for the ventilating area has been mounted in a plane offset to one side only with respect to the detention bars. In the present embodiment the detention bars integral with or suitably united to the muntin bars have been arranged to prevent the escape of inmates through the ventilating areaand the closure centrally pivoted so as to swing both inwardly and outwardly. This has been accomplished by mounting the detention bars on the inside of the outwardly swinging portion of the closure and on the outside of the inwardly swinging portion thereof.

An object of the invention is to provide a detention window with detention bars for preventing the escape through the ventilating area on either side of a centrally pivoted closure.

Another object of this invention is to provide screens for screening the ventilating area, the

screen being located on the same side as the detention bars on both sides of the closure.

Another object of this invention is to provide a detention assembly that is cheap, efficient and dependable.

Another object of this invention is to provide a pivotally mounted closure which may be substantially flush with the window assembly when in closed position, the detention bars also may be substantially flush with the outside of the window assembly,

Another object of this invention is to provide a new and novel pivotal muntin bar.

With the above primary and other incidental objects in view, as will more fully appear in the specification, the invention consists of the features of construction, the parts and combinations thereof, and the mode of operation, or their a equivalents, as hereinafter described and set forth in the claims. a

In the drawings, Fig. 1 shows a perspective view of a detention window assembly as seen from the outside. Fig. 2 is a sectional view taken across the ventilating area with the ventilating closure in closed position taken below the pivot of the closure. Fig. 3 is a similar view to that of Fig.2 but is taken above the pivot of the closure. Fig. 4 is a vertical sectional view of Fig. 1 taken through the closure when in closed position. Fig.

5 is a fragmentary sectional view of the trans 1935, Serial No. 13,456

verse pivotal bar of the closure as seen when the closure is partially open. Fig. 6 shows another modification of the pivotal bar of a closure. Fig. '7 is another modification showing the screen slipped in a well provided therefor by the deten- 5. tion bars. Figs. 8 and 9 disclose modifications. Fig. 10 is an exploded view of the pivotal assembly.

Fig. 11 discloses a fragmentary sectional view taken horizontally across a ventilating area of 10 another modification. Fig. 12 is a fragmentary sectional view similar to that shown in Fig. 11 with the closure shown in open position. Fig. 12 shows a modification slightly different from Fig. 11. Fig. 13 is a fragmentary sectional view of a 15 portion of a closure showing another modification,

Like parts are indicated by similar characters of reference throughout the several views.

In my former patents referred to above, the

centrally pivoted closure could not be used with 20 the detention bars for the reason that the detention bars are all located on'one side of the closure which would prevent the closure from swinging in opposite directions about a pivot. In

the present embodiment the ventilating closure i which swings both outwardly and inwardly abuts the detention bars located on the inside of the outwardly swinging portion of the closure and abuts the detention bars on the inside of the outwardly swinging portion, the detention bars over the lower portion of the window being located on one side of the closure and the bars over the upper portion on the opposite side thereof. In addition to the detention bars, screens cover the lower portion and the upper portion, these screens being oppositely disposed. The closure when in closed position is arranged to be substantially co-planar with the window, the glazing of the stationary portion of the window and the glazing of the closure being substantially in the same plane.

Referring to the drawings, a plurality of transversely arranged muntin bars l0 and I2, verti- 'cally and horizontally disposed, divide the window into a plurality of spaces, some of which 5 are glazed spaces l4 leaving a group of unglazed spaces l6 which form a ventilating area. Vertical bars l8 arranged in aligned relation with respect to the muntin bars Ill extend across the upper half and across the lower half of the ventilating areas but on opposite sides of the closure 20 pivotally mounted at 22. In addition to the vertical bars, horizontal bars 24 extend across the ventilating area both above and below the closure in aligned relation with the horizontal pivotal bar 28.

either intentional or accidental escape or un,

authorized entry through the window is desirable. The bars l8 and 24 located above the pivotal bar 28 and on the outside of the upper portion of. the closure swinging inwardlyprevents theescape through this portion of the ventilating area when. the closure is open. Likewise the transverse bars I8 and 24 located below the'pivotalbar'2'B and' inside the lower and outwardly swingingportionprevents escape through this portion.

As=may best be seen b'y-refrringtoFigs. .2, 3'

and i, the glazing ofthe closurer2'lls'is co-planar withlthe glazing of the glazed'ispacesill. A-pair of bars 26 and-21; sh'owriiinFig. 4, extendiiacross the 1 terminals r of the vertical detention bars l8- andare arranged tolslidingly engage the pivotal bar: 2lof1 the closure 20;

The closure frame which includes the vertical barsfl and horizontal bars 36= is-supported upon the pivotal bar 28': Theiclosure 20.? may alsov be provided'lwith the transversely arranged muntin bars 38. and 40 extending-: from: frame bar 36-: to l the pivotalbar 28 and betweenthe 'frame bars. 34 respectively. Although folithe purposesv of illustration onlyone horizontalsbar 40 has been shown in each half: of the window, a greater: or lesser numberiof: such'barsmay 'beiused: The bars 38 and 40 have'been shownin. aligned relation with respect'to the detention-bars IB'andi 24 respec- :tively so. as to hide theisamewheminclosed .posi;

tion and .to' have the appearance: of :continuations of thei'bars wand. l2. The closure'may have' a single paneion each esiderofrthe'arcuateor pivotal bar 28. A pair of screen frames 44; one locatedon' the insideand above the'pivotofithe'closure as viewed inFig. l, and the otherronthe outside and below the pivot of the' closure, are'shown. The-screen frame is preferably held inzpositionxby metallic clips 46 Y which permits the insertion of: the screen: from one side'of the closure; Iftthe-operatoris onthe? inside of the detention window: inserting.

the screenit' williof course be necessaryto raise: the screens" from the outside within 1 reach: of the operator: whomayi'then slip thetscreendn positlon; Theclips 46:-are.:preferablyresilient' SOiaSlJOI' permit flexing while inserting: the screen and:

tightly holdthe screendnposition.

The pivotal bar. 28-. is substantially. Seshaped' but is' provided with a dependent flange to. complete the arcuate surface 30. The: opposite side 32 of the bar'is aISoarcuate." and substantially concentric with respect to the arcuate surface 30.'- The endsof the pivotalbar 28 are pivotally mounted in the muntinsb'oun'ding the ventilatingarea; Thelcenter of the arcuate surfaces 301' and" 32is aligned with: the axis ofi'the' pivots. The glass 50is held1in position with putty 60'seated in. suitable recesses provided therefor in the As the window is swung froma closed'position to an open position the arcuate surfaces 32 continue contacting the transverse bars26 and 21 so' as-to prevent insects and the like. from entering the closure.-

In the modificationsshownin-Figs: 1, 4, 5 and.6

the closures are pivoted on the horizontal pivot. Instead of a horizontal pivot a vertical pivot could be used. In either case the closure greatly deters the escape or unauthorized entry through the closure, virtually functioning as a detention bar both in open and closed positions. The pivotally mounted bar 28 is especially effective to deter the escape through the window opening.

In Figs. 8and 9l'the flanges of the bars 88 and 82; the former ofwhich may be a pivotal bar,

varecovered or shielded by metallic shields 83, 84

26a'and21 respectively, may be utilized to-hold" the window closure in any adjusted position. When either the bar 28 is made 'of aluminurn' or brass-orsthe detention" bars 26-and 2'! madeof thismaterial, the friction between the surfaces 30"and=32- with the detention bars 26 and 21 respectively may be more advantageously utilized to eifectcand-hold the window closure in adjustedposition.

Referring to. Fig. 10 an exploded view ofone.

type. of pivotal mounting forthe closure has been shown; The muntin bar l0v bounding the ventilating area. carries a tubular member QUsuitably attached to the Web of the muntin bar, as by welding; Mountedwithin this-tubular member Bil/is a rotatable sleeve 92, provided with a pair of diametrically arranged kerfs or slots 94 in which is seated the Web of .the pivotably mounted muntinbar. 28, only a fragment of which has been shown for the purpose of illustration. Member 92-rotates freely within the tubular sleeve and provides a cheap and eflicient pivotable assembly.-

The screenand detention bars may be formed intov a-unitary structure, that is, the screen may be fixedly, attached to the detention bars.

In Fig. 6 a substantially C-shaped pivotal muntin barv 62 has been shown instead of the pivotal bar 28 as disclosed in Figs. 4 and 5.

Thispivotal bar' 62v is provided with a longitudinal recess which supports the glazing 50. The projections on the interior caused by the longitudinal recess forms a seat 66 for supporting the-lower glass pane. The arcuate surfaces 68 and 10 are concentric with respect to the pivot of the bar 62. and slidingly engage the screen frames or thedetention bars. The detention bars 26 and 2.1 may be spaced away from the arcuate surfaces 30and 32 or B8 and 10 as the case may be,.as-has the detention bar 69 shown in Fig. 6. If the detention bars do not contact the arcuate surfaces of the pivot bar of the closure, then it isquite desirable that the screen frame do so, as shown at H in Fig. 6. The detention bar 69 may be spaced several inches'from the pivotal bar, probably four or five inches therefrom, or more. Obviously the space between 29 and. the pivotal bar' G-Zmust be sufficiently small to prevent the passage of a human body therethrough.

In the'modification disclosed in Fig. 7, transverse detention bars 12 and 14 extend across the ventilating area, the detention bars 12 and 14 being preferably aligned with the muntin bars in the closure. The detention bars 12 and 14 are offset so as to provide a well 16 into which the screen 18 may be inserted. Thus the screen is found intermediate the offset detention bars 12 and 14 and the closure. The screen may be mounted upon a suitable frame, preferably flexible, which in thickness is not much greater than the screen per se.

In Fig. 11 a modification has been shown wherein both screens are inserted from the inside. of the window. The screen over the outwardly swinging portion of the window is located on theinside of the window, the screen over the remainder is located outside of the closure. This has been accomplished by arranging the detention bars I02, welded to the angle bar [05, in

offset relation with respect to the plane of the window, so as to provide a pocket I04 for the reception of the screen I00. The upper end of the detention bar is preferably welded directly to the muntin bar bounding the ventilating area. The screen may be removed by forcing the lower portion of the frame inwardly to permit the upper portion to clear the flange I03. The screen I ill extending over the lower portion of the clo- ...sure, that is, the outwardly swinging portion, is

also inserted from the inside. It may be removed in a manner similar to that disclosed in Fig. 2. The screen may be held in position by suitable clips not shown. The detention bars H2 are located intermediate the screen I II! and the closure.

In Fig. 12 screens I00 and H0 have been inserted from the outside. In Fig. 13 instead of the detention bars being offset in their entirety, detention bar I M has been provided with an offset portion for receiving the screen frame Hill. The screen in this modification extends parallel and in proximity to the detention bars I I4 over a greater portion of the closure.

From the above description it will be apparent that there is thus provided a device of the character described possessing the particular features of advantage before enumerated as desirable, but which obviously is susceptible of modification in its form, proportions, detail construction and arrangement of parts without departing from the principle involved or sacrificing any of its advantages.

While in order to comply with the statute, the

invention has been described in language more or less specific as to structural features, it is to be understood that the invention is not limited to the specific features. shown, but that the means and construction herein disclosed comprise the preferred form of several modes of putting the invention into effect, and the invention is therefore claimed in any of its forms or modifications within the legitimate and valid scope of the appended claims.

Having thus described my invention, I claim:

1. A detention window assembly including a plurality of transversely'arranged muntin bars dividingthe window into a. plurality of spaces, some of which are glazed leaving a space vacant for ventilating area, a closure for the ventilating area pivotably mounted for swinging movement into opposite directions, whereby the portion of the closure located on one side of the pivot swings inwardly and the other portion located on the other side of the pivot swings outwardly, externally mounted detention bars placed over the portion of the area closed by the inwardly swinging portion of the closure, internally mounted detention bars located over the remainder of the ventilating area, and a pair of screens insertable from the same side, one of which is located intermediate the detention bars and the closure and the other extending over the remaining portion of the ventilating area, whereby the corresponding detention bars extend between the closure and said other screen.

2. A detention window assembly including a plurality of transversely arranged muntin bars dividing the window into a plurality of spaces, some of which are glazed, leaving a group of spaces vacant for ventilating area, a closure for the ventilating areamounted upon a pivotally mounted horizontal bar having arcuate surfaces,

, said closure having swinging movement into opposite directions whereby the portion of the closure located above the bar swings in one direc tion and the portion located below the bar swings in the opposite direction, internally mounted detention bars contacting the arcuate surface of the pivotal bar overlying the portion of the ventilating area closed by the outwardly swinging portion of the closure, and externally mounted detention bars overlying the inwardly swinging portion of the closure.

3. A detention window assembly including a plurality of transversely arranged muntin bars dividing the window. into aplurality of spaces, some of which are glazed, leaving a group of spaces. vacant for ventilating area, a closure for the ventilating area pivotally mounted for swinging movement into opposite directions whereby the portion located on one side of the pivot swings inwardly and the other portion located on the other side of the pivot swings outwardly, externally mounted detention bars placed over the portion of the ventilating area closed by the in wardly swinging portion of the closure and internally mounted detention bars located over the remaining portion of the ventilating area, said bars being arranged in aligned relation with the muntin bars of the window so as to simulate uninterrupted detention bars.

4. A detention window assembly including a plurality of transversely arranged muntin bars dividing the window into a plurality of spaces, some of which are glazed, leaving a group of spaces vacant for ventilating area, a closure for the ventilating area pivotally mounted for swinging movement into opposite directions said 010- sure having transversely arranged muntin bars and externally mounted detention bars placed over the portion of the ventilating area closed by the inwardly swinging portion of the closure swings inwardly and the portion located on the other side of the pivot swings outwardly, externally mounted detention bars overlying the area closed by the inwardly swinging portion of the closure, internally mounted detention bars located over the remaining portion of the ventilating area, and screens contiguous to the detention-bars for screening the ventilating area.

6. A detention window assembly including a pluralityuof transversely arrangedimuntin' bars:

dividing the window into a plurality of: spaces,

some of which are glazed, leavinga group of' spaces vacant for ventilating area, axclosure for the ventilating area pivotally mounted for swinging movement; into opposite directions wherebythe portion located on one side of the pivot swings inwardly and the portion located on the other side of the pivot swings outwardly, externally mounted detention bars overlying the area closed by the inwardly swinging portion of the closure, internally mounted detention bars located over the remaining portionof the ventilating area, a removably mounted screen assembly mounted contiguous to the internally mounted detention bars and a second screen assembly mounted contiguous to the externally mounted detention bars. 7. A closure assembly for a ventilating area including a frame, a closure pivotally mounted for 1 swinging movement in opposite directions whereby one portion swings inwardly and another portion swings-outwardly, protective'means carried by said frame and overlying theoutwardly swinging portion of the closure, anrexternally protecitive means overlying the inwardly portion of the closure, said closure including ahollow substantially c-shaped pivotal bar having its axis symmetrical with the closure arcuate surfaces contacting said protective means, the center of the #:radius of curvature of said arcuate surfaces being located between the planes formed by the margins of the frame, said c-shaped bar being adapted to'support glazing of the closure, the glazing extending in one direction being seated .-.within the hollow of the C-shaped bar and the glazing extending in the opposite direction being seated on outer surface of the C-shapedv bar. 8. A closure assembly for a ventilating area including a frame, a closure pivotally mounted for swinging movement in opposite directions whereby one portion swings inwardly and another portion swings outwardly, protective means carried by said frame and overlying the outwardly swinging portion of the closure, oppositely disposed protective means overlying the inwardly swinging portion of the closure, said closure including a C-shaped pivotal bar the axis of'which is within the confines of the closure and located between the planes formed by theouter margins of the frame, said c-shaped pivotal bar having arcuate surfaces contacting the protective means and including a longitudinal recess in which is seated the glazing of the closure.

9; A closure assembly for a ventilating area in'-- mediate the oppositely disposed protective meansv for supporting the glazing of the closure, the center of the radius of curvature of the tubular bar being located between the planes formed by the margins of the frame.

10. A detention window assembly includinga plurality of transversely arranged muntin bars dividing the window into a plurality of spaces, some of which are glazed, leaving a group .of

spacesvacantfor" ventilatingarea, a closure for the ventilating areaipivotally mounted for swinging movement into opposite. directions whereby the portiontlocated on one side of the pivot swings.

inwardly and: the remainder swings outwardly, externally mounted detention bars placed over the portion of the ventilating area closed by the inwardly swinging portion of the closure, internally mounted detention bars located over the remaining portion of the ventilating area, and a screen assembly. including a screen associated with the. external barsfor protecting the portion of the ventilating area closed by the inwardly swinging portion and. a screen associated with the internally mounted detention bars for protecting the remainder of the ventilating area.

11. A detention window assembly including a plurality of transversely arranged muntin bars dividing the' window into a plurality of spaces some of which are glazed leaving a group of spaces vacant for ventilating area, a movably mounted closure for, the ventilating area, externally mounted detention bars placed over a portion oftheventilating area and. internally mounted detention bars extending over the remaining portion of the ventilating area, said closure positioned intermediate the detention bars.

12; A detention window assembly including a pluralityv of muntin bars dividing the window into a plurality of spaces, some of which are glazed leaving a group of spaces vacant for ventilating area, a closure unit for the ventilating area including a fixed frame and a closure movably mounted therein, detention bars overlying at least a portion of the ventilating area to prevent the free egress'and ingress of human bodies therethrough, the detention bars being deflected to form a pocket, and a screen for covering the ventilating area, said screen being positioned in the pocket.

13. A- detention window'assembly including a plurality of transversely arranged muntin bars dividing the window into a plurality of spaces, some. of which are glazed leaving a group of spaces vacant for ventilating area, detention bars having at least a portion thereof deflected out of the plane of the window, said detention bars extending over the ventilating area to prevent the ingressand egress of human bodies from the more vulnerable area, a closure unit for the ventilating area, the closure unit including a fixed frame and a movableclosure mounted therein arranged to form a pocket intermediate the detention bars and the closure unit and a screen mounted in said pocket for protecting at least a portion of the ventilating area.

14. Adetention window assembly including a plurality of transversely arranged muntin bars dividing the window into a plurality of spaces, some of which are glazed, leaving a group of spaces vacant for ventilating area, a closure for the ventilating area mounted upon a pivotally mounted horizontal bar having arcuate surfaces of rustresisting metal, the center of the radius of curvature of said arcuate surfaces located betweenlthe planes common tothe margins of the muntin bars, said closure having swinging movement'into opposite directions whereby the portion of the closure located above-the bar swings in one direction and the portion located below the bar swings in the opposite direction, internally mounted detention bars contacting the arcuate surface of the pivotal baroverlying the portion of the ventilating area closed by the outwardly swinging portion. of the closure, and externally mountedadetention barsoverlying the inwardly swingingrportionrof the closure.

15. A detention window assembly including-1a plurality: of transversely arranged: muntin bars dividing the window" into a: plurality of spaces some of which are glazed: leaving a: group of: spa'ces vacant for ventilating area, a pivotally mounted closure for the ventilating area, said closure having a-central pivotal bar provided with arcuat'esur-faces having the center of radius of curvaturelocated between the planes common to the margins of the muntinrba'rs; said closure being mounted upon a pair of tubular hinge members telescopically engaging a :second pair of tubular hinge members fixedly; attached: to" the muntin barsbounding the ventilatingarea, the axis of the tubular member being coincidentwith said center of radius-01 curvature; externally mounted detention bars-placed overa portiongof Y the ventilating area, and internally mounted detention bars extendingover-theremaining portion of the ventilating area, said closure being positioned intermediate the detention bars but in engagement therewith.

16. A detention window assembly including a plurality of transversely arranged muntin bars dividing the window into a plurality of spaces some of which are glazed leaving a group of spaces vacant for ventilating area, a pivotally mounted closure for the ventilating area, said closure having an arcuate bar concentrically disposed With respect to the axis of the pivotal mounting, externally mounted detention bars placed over a portion of the ventilating area, internally mounted detention bars extending over the remaining portions of the ventilating area, said closure positioned intermediate the detention bars, a screen mounted over the portion of the ventilating area protected by the externally mounted detention bars and a second screen mounted over the area protected by the internally mounted detention bars, said screens cooperating with said arcuate bar to form fly tightness.

17. A detention window assembly including a plurality of transversely arranged muntin bars dividing the window into a plurality of spaces some of which are glazed leaving a group of spaces vacant for ventilating area, a pivotally mounted closure for the ventilating area, said closure including an arcuate bar concentrically mounted with respect to the pivot of the closure, said concentric bar having longitudinal grooves for the reception of the glazing, externally mounted detention bars placed over a portion of the ventilating area, and internally mounted detention bars extending over the remaining portion of the ventilating area, said closure being positioned intermediate the detention bars.

18. A detention Window assembly including a plurality of transversely arranged muntin bars dividing the window into a plurality of spaces some of which are glazed leaving a group of spaces vacant for ventilating area, a pivotally mounted closure for the ventilating area, said closure including a bar having non-ferrous metallic arcuate surfaces concentrically disposed with respect to the pivot of the closure, which pivot is located between the planes formed by the margins of the muntin bars, externally mounted detention bars placed over a portion of ventilating area, and internally mounted detention bars extending over the remaining portion of the ventilating area, said closure being positioned intermediate the detention bars.

1931p detention window assembly-includinga plurality oflmuntinbars dividing the window into arpluralityz of spacest someof which are glazed leaving: a group9of spaces vacant for ventilating area; closurerunitafor the ventilating area including a closu're' movably'mounted therein, detention bars overlying at' least a portion of the ventilating area: to prevent the-free egress and ingressrof humanbodies therethrough, the detention bars 'being' defiectedtoform arcuate portions constituting apocket and a screen for coveringithexventilating area, said screen being positionedllin': the: pocket.

.20.Aidetentionewindowr assembly including a plurality of: transversely arranged muntin] bars dividingr the window' into" a plurality of. spaces some of whicharer-glazed leaving a group of spaces vacanti for ventilating area, a pivotally mounted CIOSllI'BifOI the ventilatingzarea', said closure includingz a bar havinginonsferrousl metallic arcuate surfaces" ofi rust-resisting material, externally mounted detention bars placed over a portion of the ventilating area arranged in scraping relation with respect to the arcuate surfaces and internally mounted detention bars extending over the remaining portion of the ventilating area and arranged in soraping'relation with respect to other portions of the arcuate surfaces, said closure being positioned intermediate the detention bars.

21. A detention window assembly including a plurality of transversely arranged muntin bars dividing the window into a plurality of spaces, some of which are glazed, leaving a group of spaces vacant for ventilating area, a closure for the ventilating area pivotally mounted upon a horizontal bar constituting an axis for swinging movement in opposite directions, whereby the portion of the closure located below the axis swings in one direction and the portion located above the axis in the opposite direction, at least one bar thereof having a surface covered with non-corrosive metal, externally mounted detention bars placed over the portion of the closure swinging inwardly, and internally mounted detention bars extending over the outwardly swinging portion.

22. A detention window assembly including a plurality of transversely arranged muntin bars dividing the window into a plurality of spaces, some of which are glazed, leaving a group of spaces vacant for ventilating area, a closure for the ventilating area pivotally mounted for swinging movement into opposite directions, whereby the portion located on one side of the pivot swings outwardly and the remainder of the closure swings inwardly, a window pane mounted in the outwardly swinging portion of the closure, another window pane mounted in the inwardly swinging portion of the closure below the pivot, said pivot including a pair of telescopically mounted tubular members, externally mounted detention bars placed over the portion of the ventilating area protected by the inwardly swinging portion of the closure, and internally mounted detention bars located over the remaining portion of the ventilating area.

23. A detention window assembly including a plurality of transversely arranged muntin bars dividing the window into a plurality of spaces some of which are glazed leaving a group of spaces vacant for ventilating area, a movably mounted closure for the ventilating area including a pivot bar having a non-corrosive surface, externally mounted detention bars placed over half of the ventilating area on the outside of'the closure, internally mounted detention bars ex-, tending over the balance of .the ventilating area, said internally mounted bars extending inside the closure, and a pair of screens, one edge of each screen cooperating with said non-corrosive surface to provide fly-tightness.

24'.'In a detention window assembly a frame, a closure having a central bar provided with an arcuate outer surface, means for pivotally mounting said closure in said frame for swinging movement in opposite directions, whereby the portion of the closure located on one side of the pivot swings inwardly and the remainder swings outwardly, said means including telescoping hinge members, the outer diameter of the larger member being less than the diameter of the arcuate surface of said central bar, externally mounted detention bars carried by said frame and placed over the portion closed by the inwardly swinging portion of the closure, and internally mounted detention bars located over the remaining portion of the closure to prevent the escape of human beings through said frame.

25. A closure assembly for a ventilating area having a frame, a closure pivotally mounted for swinging movement in opposite directions, whereby one portion swings inwardly and another portion swings outwardly, said closure including a hollow substantially C-shaped pivotal bar having its axis symmetrical with the closure, the center of the radius of curvature of the arcuate surface of the C-shaped bar being located between the planes formed by the margins of the frame, said C-shaped bar being adapted to support the glazing of the closure, the glazing extending in one direction being seated within the hollow of the C-shaped bar and the glazing extending in the opposite direction being seated on the outer surface of the O-shaped bar.

WILLIAM D. BAYLEY. 

